Crank shaft



July 4, 1933. H. PERAzzoLl 1,917,148

CRANK SHAFT Filed Deo. 10, 1952 2 sheets-sheet 1 H. PERAZZOLI CRANK SHAFT Juy 4, 1933.

Filed Deo. l0, 1932 2 Sheets-Sheet 2 Patented July 4, 1933 TES rrisn sra HENRY PERAZZOLL OF PHILADELPHIA, PENNSYLVANIA GRANK SHAFT Application filed ecember 10, 1932.

This invention relates generally to new and useful improvements in ball bearing connections and has more particular reference Vto a novel andl eflicient ball bearing assembly primarily designed for securing a connecting rod to the crank pin of a crank shaft.

An important object of the present invention is to improve generally the manner of securing the connecting rod to the vcrank shaft in a manner reducing to a minimum the amount of friction between said shaft and the rod. f

i'lnother important object of the invention is to provide a cennectingrod and cra-nk shaft mechanism which may be quickly and easily adjusted to take up play in therelatively moving` parts thereof. y

A more specific object of the invention is to proide a connecting rod having a hub arranged to embrace the crank pin of a crank shaft, the hub being of continuous annular configuration `and a. continuous ball bearing ring structure therein whereby the customary split hub and bearing elements may be eliminated.-

A further object of 'the invention is to provide a crank shaft comprising the customary crank pin offset therefronn the saidcrank shaft being separable at the juncture of the crank pin and its supporting arm to permit mon ting of the annular hub structure of the connecting rod thereon.

il further object of the invention is to provide a connecting rod and crank shaft structure wl embodies relatively few parts and of extremely simple, yet rugged construction capable of withstanding substant'ally heavy thrust loads at relatively high speed.

These and other objects and details of construction ofthe invention are set forth hereinafter and disclosed in the accompanying dra-wings, in which:

Figure l is a View in elevation of the crank shaft and crank pin showing in section, the connecting rod hub and bearing assembly associated therewith;

2 is an vend view of the disclosure in l; i Figs.

3 and 4l respectively, are views in per- Serial No. 646,651

spective showing the novel construction of the sectional crank shaft;

Fig. 5 is a View in section on line 5-5, Fig. l; and

Fig. 6 is a view in section on line 6 6, Fig. 2.

Referring more particularly to the drawings, l is a crank shaft having a crank pin 2 offset therefrom by webs or arms 3 which extend beyond the axis of the crank shaft l in a direction opposite the crank pin 2 for the purpose of affording counterwelight elementsy Ll effecting proper balance of the crank shaft assembly during rotation thereof.

As will be noted by referring to Figs. 8 and l of the drawings, the crank shaft comprises separable sections A and B respectively, the line of `jointure thereof being at one end of the crank pin 21. A`circular boss 5 is formed on the outer end face of the'crank pin' 2 and centrally disposed concentrically with respect thereto; A circular boss 6 of lsubstantially smaller diameten projects outwardly from the outer face of the circular boss 5 and isI eccentrically positioned with respect to the latter. The complementary section B of the crank shaft is provided with a projecting annular flange Z which embraces the boss 5 and cooperates with the crank pin 2 toform y n .D a shoulder 8 similar toa shoulder 9 formed on the opposite end of the said crank pin 2, the purpose for which will beset forth hereinafter.

The internal diameter of the proj-ecting\ annular flange 7 is substantially equal to the diameter of the circular boss 5 and the latter is arranged for insertion in the recess 9 bounded by the internal wall of the flange 7. The eccentrically positioned boss 6 is arranged to engage an aperture lO suitably formed in the arm l of the crank shaft section B.

It is pointed out that the machining of the v bosses 5 and 6 and the internal diameter of the projecting annular flange 7 and the aperture 1() should be carried out with sufficient accuracy to insure a substantially snug fitting of said bosses therein andvthus lock the V respective crank shaft sections A and B to flo the T-shaped slot 25 to permitentrance ot the pin 26 into the slots 24 in the retaining ng ring 28 is then placed upon the peripheral surface of the flange 7 constituting' the shoulder El of the crank shaft s. 'on A and the respective sections A and said shaft are joined together' by placing the' bosses 5 and (i into engagement with the aperture l0 andthe space residing internally ot the annular flange l in the manner disclosed in Figs. l and 6 of the drawings. The bolts i3 and l5 are threaded into the taps ll and 'il formed respectii/'ely in the arm l oi' the section A and the adjacent tace of the :rank pin boss 5,.the said screws 'functioning to rigidly secure., or rather firmly join the two crank shattsections A and B in a rigid strong joint, the construction of which precludes any possibility of relative rotation between either of the crank shaft sections A or B.

it, after considerable usage of the crank shaft and connecting rod mounted thereon, a certain amount of play exists in the connecting rod and bearing n'iounting on the crank pin 2, such play may be taken up and eliminated by withdrawing the pin 26 from the iiiarticular upwardly inclined slot 24 and the T-shaped slot 25 and the retaining ring 23 threaded still i'rther inwardly of the crank connecting rod hub 16, the saidpin 23 being reinserted in the rishaped slot 25 and the particular upwardly inclined slot 24 ot the ring 1a/'hen said ring has been advanced inwardly oit tlie hub 'i6 a suliicient distance to eliminate any looseness or tree play existing in the connecingrod and bearing mounted upon the crank shaft .t is pointed out that while the particular disclosure in this treatise has embodied a crank shaft haring but one crank arm and pin, it is within the province of this invention to provide a sectional crank shaft comprising innumeralde sections and crank` arms yof the general character disclosed. lt is further intended that novel construction 'for moui'iting the connecting rod upon the crank pin may be equally well adapted to mounting the other end oi the connecting rod to its piston er any other member that it may be desired to actuate by a crank sha-ft and rod arrangement.

lt is further pointed ont that certain installations oft the ball bearing mounting of a cone nee i. and a similar mounting oi the wrist pin end of the connecting rod forth in the preceding paragraph, it may be desirable, in or'- der to facilitate the handling and operation or" the machine, that the connecting rod be made in two or more sections which may be joined together' in suitable manner such. as by bolts, pins or other similar means.,

While the particular detail construction of rod on the crank pin of a cranl shaft the present invention `has beenv set forth for the purpose of description, it is not intended that the invention be limited thereto except such 'as is without the scope of the annexed claims.

vWhat is claimed is:

v1. In an anti-friction bearing assembly, the combination of a crank shaft having a crank section and pin, a bearing mounted on said pin, said bearing .including inner and outer one-piece rings interposed. by ball bearings, a connecting rod hub embracing the bearings and being` provided with a channeled retaining flange at one end thereoia retaining ring threaded internally at the other end and arranged to abut the annular face of the onepiece outer bearing ring of the adjacent bearing, the periphery of the said retaining ring being provided with a plurality `of spaced slots therein, a pin extending inwardly from the hub and engaging one of said slots in said retaining ring for securing the latter in predetermined position with respect to said hub, said pin being removable from said slots to permit adjustment of the retaining' ring both inwardly and outwardly with respect to the bearings to permit play occurring in the assembly to be eliminated, and a closure ring overlying the annular face' of the 'retaining ring. Y

2. in an anti-friction bearing assembly, the combination of a sectional crank shaft, one of said sections having a crank section and pin, a bearing mounted yon said pin, said bearing including inner and outer one-piece rings interposed by ball bearings, a one piece connecting rod hub embracing the bearings andbeing provided with a channeled retaining flange at one end thereof, a retaining ring-threaded internally at the other end and arranged to abut the annular face. of the one-piece outer bearing ring of the adjacent bearing, the periphery of the said retaining ring being provided with a plurality of spaced inclined slots therein, a pin extending inwardly 'from the hub and engaging one of said slots in said retaining ring for securing the latter in predetermined position with respect to said hub, said pin being removable from said slots to permit adjustment of the retaining ring both inwardly and outwardly with respect to the bearings to permit play occurring in the assembly to be eliminated, and a closure ring overlying` the annular face of the retaining ring.

3. In an anti-friction bearing assembly, the combination of a crank shaft having a crank section and pin, and anti-friction bearing mounted on said pin, said bearing in-v cluding inner and outer one-piece rings interposed by ball bearings, a connecting rod hub embracing the bearing and provided with a channeled retaining flange at one end, means in the channel of said flange contacting with said crank pin shaft constituting a seal preventing leakage of oil outwardly from said bearing, a retaining ring threaded internally of the other end thereof and arranged to abut the annular face of the onepiece outer bearing ring of the adjacent bearing, the periphery of the said retaining ring being provided with a plurality of spaced inclined slots therein, a pin extending inwardly from the hub and engaging one of said slots in said retaining ring for securing the latter in predetermined position with respect to said hub, said pin being removable from said slots to permit adjustment of the retaining ring both inwardly and outwardly with respect to the bearings to permit play occurring in the assembly to be eliminated, and a closure ring overlying the annular face of the retaining ring.

l. ln an anti-friction bearing assembly the combination of a sectional crank shaft lia-Vinor a crank section and pin, said crank shaft bein g removably joined together at the juncture of one crank section and said pin, a shoulder formed adjacent each end 0f the crank pin, a connecting rod hub surrounding the crank pin and provided with a channeled retaining ilange at one end, means in the channel of said flange contacting with one crank pin shoulder to form a seal preventing leakage of oil outwardly of the assembly, an antifriction bearing mounted on the crank pin and interposed between said pin and the connecting rod hub, said bearing including inner j and outer one-piece rings separated by ball Cil bearings, a retaining ring threaded internally of the other end of the hub and arranged to abut the annular face of the one piece outer bearing ring of the adjacent bearing, the periphery of said retaining ring being provid-ed with a plurality of spaced inclined slots therein, a pin extending inwardly from the hub and engaging one of said slots in said retaining ring for securing the latter in predetermined position with respect to said hub, said pin being removable from said slots to permit adjustment of the retaining ring both inwardly and outwardly with respect to the bearings to permit play occurring in the assembly to be eliminated, and a closure ring overlying the annular face of the retaining'ring.

5. In an anti-friction bearing assembly,

retaining ring.

the combination of a sectional crank shaft having a crank section and pin, said sections being joined together at the juncture of one crank section and the pin and rigidly maintained in assembled relation by means of bolts, a shoulder formed adjacent each end of the crank pin, a connecting rod hub surrounding the crank pin and provided with a channeled retaining flange at one end, means in thechannel of said flange contacting with oiie crank pin shoulder to form a sealV preventing leakage of oil outwardly of the assembly, an anti-friction bearing mounted on thecrank pin and interposed between said pin and the connecting rod hub, said bearing including inner and outer one-'piece rings separated by ball bearings, a retaining ring threaded internally of the other end thereof and arranged to abut the annular face of the one-piece outer bearing ring ofthe adjacent bearing, the periphery of the said retaining ing being provided with a plurality of spaced inclined slots therein, a pin extending inwardly from the hub and engaging one of said slots in said retaining ring for securing the latter in predetermined position with respect to said hub, said pin being removable from said slots to permit adjustment of the retaining ring both inwardly and outwardly with respect to the bearings to permit play occurring in the assembly to be eliminated, and a closure ring overlying the annular face of the retaining ring.

6. ln an anti-friction bearing assembly, the combination of a sectional crank shaft, one of said sections having a crank section and pin, a bearing mounted on said pin, said bearing including inner and outer rings interposed by ball bea-rings, a connecting rod hub Y embracing the bearings, a retaining ring threaded internally at the other end and arranged to abut the annular face of the outer bearing ring of the adjacent bearing, the periphery of the said retaining ring being provided with a plurality of slots therein, a pin extending inwardly from the hub and engaging one of said slots in said retaining ring for securing the latter `in predetermined position with respect to said hub, and a closure ring overlying the annular face of the HENRY rnaAZZoLi. 

